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2020 Issue-4

Current Issue

The Electric Brains Of Yesteryear.

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Features

Pinochle — Social Distance Style

What do you do when you can’t play cards together because of the pandemic? You figure out a way to do it electronically over Zoom!


Some Simple Transistor and IC Circuits

Two Nuts & Volts questions motivated me to relearn about bipolar transistors.


Take the Z80 Challenge

Take the Z80 challenge and build something that’s both classic and modern at the same time.


An Altair Clone: Then and Now

The resources available today compared to what was available in 1977 make all the difference in projects.


The Electric Brains of Yesteryear

Get Geniacs and Brainiacs from decades ago working again.


eTracer Digital Tube Tester and Curve Tracer Kit

This time in our restoration series, we take on a digital tube tester and curve tracer kit.



Projects

Build the FLiPVox Laser Theremin

Here’s an analog style laser Theremin with its own built-in synthesizer.


Build a Freezer Alarm Circuit

Save your food with an alarm that alerts you if the freezer’s open.


Updating a General-purpose Programming System

It was clearly time for an update to my LP120 that I originally built 20 years ago.


Build a Lunch Box Jukebox

Take your fun with you in an all-in-one entertainment system you build yourself.


Build an Instant Heart Pulse Sensor

Make your own version of a Fitbit of sorts for monitoring blood flow.


Build a $6 Desk Mic

Turn a cheap LED lamp into a usable microphone.


Departments

New Products (04.2020)
Versatile DC Lab Power Supply, 4-CH Mixed-signal Oscilloscopes, Industrial Grade RF Coaxial Cable Assemblies, 6PC Fused Probe DMM Electrical Kit, High Power Dual Port AC/DC Charger, Rack Mount O'scope, Sunlight Readable LCD Display

Increasing Complexity: Unavoidable?
by Bryan Bergeron
Why do experimenters always feel the need to make things better?

Reader Feedback (04.2020)
Comments from readers.